Problem with case sensitive in loading controllers

I am using Codeigniter 3.0

I am experiencing some strange behaviour in codeignitor.

i have two methods in my Profile controller, an index() and a user().

When i visit localhost/profile/ I get the index as expected.

When i visit localhost/profile/user/… i get a 404. However if i capitilize the controller name to localhost/Profile/user/… then i see my user method.

If i change the class name to lowercase in the controller then my index method will not load up either.

Anybody have any ideas?

Thanks in advance